Means for pulling form ties from cast concrete



May 2, 1939. s. s. COLT MEANS FOR PULLING FORM TIES FROM CAST CONCRETE Filed May 5, 1938 2 Sheets-Sheet l UTL IIIIIE IIIIL g INVENTOR. fir/MAST air; BYi

ATTORNEY.

May 2, 1939.

MEANS FOR PULLING FORM TIES FROM CAST CONCRETE mmmm mum

-s. s. COLT 2,156,528

Filed May 5, 1938 2 Sheets-Sheet 2 INVENTOR.

ATTORNEY.

Patented May 2, 1939 UNITED sr-r NT orr Samuel S. Colt, West Orange, N. J.

Application May 3, 1938, Serial No. 205,698

Claims.

This invention relates to means for withdrawing form wall tie rods, wires and the like from cast concrete and for other rod and wire pulling operations.

This invention has for an object to provide a simple, effective and easily 'manipulated tool which is especially adapted for pulling form wall tie rods, wires and the like out of finished con.- crete structures after dismantling of the forms in which the concrete has been cast, but which is also adapted for other similar operations.

This invention has for another object to pro- Vide a novel tool for the purposes above mentioned, comprising a winch-roll means and cooperative work gripping means together with lever means for applying power thereto, and means in combination therewith for coiling up the extracted rod or wire so that the extracted portions thereof are so disposed as to avoid impeding operative manipulation of the tool.

The invention has for a further object to provide novel means for guiding and controlling the rod or wire operated upon as it passes to and is manipulated by the winch-roll means and the cooperative work gripping means; means being also provided to permit a secondary operation of the tool in such manner as to release the rod or wire guiding means from operative relation to the rod or wire worked upon preparatory to disengaging the tool from the latter.

Other objects of this invention, not at this time more particularly enumerated, will be understood from the following detailed description of the same.

Illustrative embodiments of this invention are shown in the accompanying drawings, in which:

Fig. 1 is a side elevation of the novel rod or wire pulling tool as applied to the work in the performance of its functions; Fig. 2 is a fragmentary front elevation of the same; Fig. 3 is a horizontal sectional view of the same, taken on line 3-3 in Fig. 1; and Fig. 4 is a side elevation of the tool as disposed for secondary operation preparatory to disengaging the tool from the work.

Fig. 5 is a fragmentary side elevation of a modifled form of the tool; and Fig. 6 is a vertical cross section of the same, taken on line 6-6 in Fig. 5.

Similar characters of reference are employed in the above described views, to indicate corresponding parts.

Referring to the drawings, the reference character It] indicates a cast concrete mass from the face of which a wall of the form in which the "mass wascast has been removed, leaving exposed aprojecting end of an imbedded form Wall tie rod ll desired to be extracted from the concrete mass.

The novel tool, according to this invention, is

especially adapted to serve as an implement for withdrawing tie rods or wires, as the case may be, from a cast concrete mass, but is also adapted to serve many other analogous extracting purposes. The novel tool comprises a foot member !2 from which projects a bearing bracket it that terminates in a laterally'disposed bearing hub it. Mounted in said bearing hub M is a pivoting means, preferably in the form of a journal bolt 55. Fulcrumed on said journal bolt I5 is a hand lever It. Also mounted on said journal bolt 15,-

' adjacent to the outer face of said lever it, is a winch-roll l1. Associated with said winch-roll [1, either as a separate element or integral there 2! being substantially tangent to the top circurnferential surface of the latter.v Said guide channel 20 is boundedby inner and outer side walls 22 and 23. Slidably supported by and between a perforate lug 24, which also extends from said foot-member l2, and said guide channel side walls 5 22 and 23 is a retractable guard pin 25, which normally extends across said guide channel 20 above a tie-rod ll. passed through the latter. The lower outer side of said block i9 is provided with a sheer cam face 26 which inclines from a plane corresponding to the inner face plane of said winch-roll I! to the plane of the outer face of saidblock I9.

Mounted on the hand lever It in parallel spaced relation thereto and above the winch-roll I! is.... 5

a strap-member 21 to form with said hand lever a bifurcate mounting for the support of a releaseable rod or wire gripping means to cooperate with said winch-roll H, the same being pivotally mounted on a transverse pivot pin 28 which is supported by and between said hand lever l6 and strap member 2! above the top of said winch-roll. Said gripping means comprises an eccentric gripper head 29 having gripping serrations or teeth 30 formed onperipheral por-J;

tions thereof. Extending from said gripper head 29 is a lever arm 3| for manipulating the same.

Also pivotally mounted on said pivot pin 28, adjacent the outer face of the hand lever I6, is an auxiliary hand lever fulcruming means, the same comprising an arm 32 provided at its free extremity with a transverse abutment piece or foot 33. Initially said arm 32 is upswung to and out of service position, as shown in Figs. 1 to 3 inclusive, and the same is retained in this position by a removable keeper pin 34 which is engaged through aligned perforations provided for the reception thereof in said hand lever 16 and strap member 21; it will be understood, however, that any other form of releasable keeper means found expedient may be used to releaseably retain said arm 32 in said out of service position.

In the use and operation of the tool, after a form wall has been removed from the concrete mass In, and the projecting end portion of a tierod, tire wire or the like II is thereupon exposed and rendered accessible. Said rod, wire or the like, if necessary, is out 01f to leave a comparatively short protruding end portion, whereupon the tool is operatively applied to the latter. In so applying the tool, the foot -member I2 is abutted upon the face of the concrete mass In in such manner that the tie rod end portion extends through the guide channel 20 of the block l9, and thence over the top of said winch-roll IT. The guard pin 25 is pushed inward across the guide channel 20 so as to extend above and across the tie-rod I l extending therethrough, thus preventing displacement of the foot member and associated parts therefrom.

With the tool initially positioned as described,.

the hand lever I6 is swung to substantially upright position, whereupon, the gripper head 25 is swung downwardly to engage the serrationsor teeth 35 on the concentric periphery thereof with the tie-rod ll, so as to grippingly engage the latter between the. winch-roll I! and said gripper head. When the tie-rod end portion is thus gripped, the operator grasps the hand lever l6 and exerts a downward swinging pull thereon, thereby causing the winch-roll I! to rotate in a clock-wise direction, and so as to coil or wind about the same the engaged end of said tierod H. The winding effect thus exerted upon the tie-rod l! produces a strong and steady outwardly moving pull upon the imbedded portion of the tie-rod, which both loosens the same from the concrete mass 10 and starts the same outwardly therethrough. After the initial movement is thus produced, the hand lever 16 is swung back to up-raised position, and then again swung down with renewed gripping of the tie-rod to accomplish a further outward advance of the tierod. These operations are repeated until a substantial portion of the imbedded tie-rod has emerged from the concrete mass l0. As these operations are repeated the tie-rod H will continue to wind around the winch-roll and its associated mandrel roll l8, being caused to spirally coil thereabout, and thus being prevented from impeding the operations. The advancing spiral formation of the thus coiled tie-rod is assured by reason of the fact that the leading end of the tie-rod is carried into engagement with the sheer cam face 26 of the block l9, and, as moved across the face of the latter, is caused to sheer ofl? or travel outwardly over the mandrel roll IS in a spiral path.

When a desired linear extent of the tie-rod H has been extracted by the described tool operations, sufficient to thoroughly loosen the remaining imbedded portion of said tie-rod, and it is thereupon desired to disengage the tool from the tie-rod, the auxiliary tool fulcruming means is released by withdrawing the keeper pin 34. The arm 32 constituting said auxiliary fulcruming means is swung down to service position wherein its abutment piece or foot 33 engages the face of the concrete mass In above the foot member l2. With the hand lever supported by said fulcruming means, the same is swung inwardly, turning in such case about the pivot pin 28 as a fulcrum held relatively stationary by the bracing. Prior to such movement of the hand lever, the guard pin 25 is outwardly withdrawn from across the guide channel 20, thus leaving the open top of the latter unimpeded. By such movement the lower end of the hand lever I6 is caused to swing outwardly and away from the face of the concrete mass Hi, carrying outwardly therewith said foot member I2, which is thus released and moved away therefrom. W'hen thus released, said foot member is free to swing about the axis of the journal bolt l5, and by gravity does swing downward to the position shown in Fig. 4, wherein the guide channel 2G is fully withdrawn from about the tie-rod ll. When the tool is thus disposed, it may then be laterally drawn away from the coiled formation into which the extracted portion of the tie-rod has been wrought, thus disengaging the tool from the work so that it may be laid aside.

After the tool is removed in the manner mentioned, the operator may grasp the coiled end portion of the tie-rod, and may complete the extraction of the tie-rod by hand. If desired, this operation may be facilitated and assisted by inserting a bar or piece of pipe through the coiled end portion of the tie-rod for use as a pulling and twisting aid.

In Figs. 'and 6 of the drawings, a modified form of winch-roll is shown which combines therewith means for guiding and holding the tierod i l in operative relation thereto as it is drawn forward thereon during the bending and coiling operations. In preferred arrangement, this modified form of winch-roll comprises a roll body 35 which is secured to the hand lever It by a pin 36 so as to swing therewith about the journal bolt I5. Integrally formed upon said winch-roll body 35, to extend along the inner upper extent of its outer peripheral margin, is a radially extending guide flange 31. This guide flange abuts the outer side of the tie-rod as it moves onto the periphery of the winch-roll, and thus guides the same as it coils around the roll until its free end engages the sheer cam face 26, to thereby deflect the tie-rod body as it is wound, so that the formed coils are progressively worked outwardly off the winch-roll. When this type of winch-roll is employed, the outer side wall 23 of the guide channel 23 may be omitted, if desired.

From the above description it will be apparent that a very simple and yet efiicient and easily manipulated tool is provided by the instant invention for the purposes mentioned.

I am aware that changes could be made in the construction of the above described tool, and

many apparently widely different embodiments" of this invention could be made without departing from the scope thereof. It is therefore intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. In a tool for the purposes described, a foot member, a hand-lever. means fulcrumed in connection with said foot member, winch-roll means rotative about the fulcrum of said hand lever means, gripper means mounted on said hand lever means for cooperation with said winch-roll means, and a sheer cam means carried by said foot member adjacent the rearward side of said winch-roll means, said sheer cam means being adapted to engage and laterally deflect a rod or wire as wound about said winch-roll means so as to form the same into a spiral coil laterally extended from a side of said winch-roll means.

2. A tool for the purposes described and as defined in claim 1, having a channeled guide means for the rod or wire extending from the abutment face of said foot member to the winchroll means.

3. A tool for the purposes described and as defined in claim 1, having an upwardly open channeled guide means for the rod or wire extending from the abutment face of said foot member to the Winch-roll means, and a releaseable guard means projectable across said channeled guide means above the rod or wire passing therethrough.

4. In a tool for the purposes described, a foot member, a hand lever means fulcrumed in connection with said loot member, winch-roll means rotative about the fulcrum of said hand lever means, gripper means mounted on said hand lever means for cooperation with said winchroll means, a sheer cam means carried by said foot member adjacent to the rearward side of said winch-roll means, said sheer cam means being adapted to engage and laterally deflect a rod or wire as wound about said winch-roll means so as to form the same into a spiral coil laterally extended from a side of said winch-roll means, a channeled guide means for the rod or wire extending from the abutment face of said foot member to the winch-roll means, and an auxiliary hand lever fulcruming means adapted, when in service position, to pivotally support said hand lever for swinging movement adapted to permit displacement of said foot member from normal operative position for turning to a position adapted to release said channeled guide means from a rod or wire and thereby permitting withdrawal of said Winch-roll means from the formed coil of the latter when detaching the tool from the work.

5. A tool of the kind described and as defined in claim 4, having a releasable guard means projectable acrosssaid channeled guide means above the rod or wire passing therethrough.

SAMUEL S. COLT. 

